content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.schedulers;
  
  import hu.akarnokd.reactive4javaflow.*;
  import hu.akarnokd.reactive4javaflow.functionals.AutoDisposable;
  
  import java.util.concurrent.TimeUnit;
  
  public enum ImmediateSchedulerService implements SchedulerService, SchedulerService.Worker {
      INSTANCE;
  
      static final AutoDisposable DONE = new ImmediatelyDone();
  
      @Override
      public AutoDisposable schedule(Runnable task) {
          try {
              task.run();
          } catch (Throwable ex) {
              FolyamPlugins.onError(ex);
          }
          return DONE;
      }
  
      @Override
      public AutoDisposable schedule(Runnable task, long delay, TimeUnit unit) {
          throw new UnsupportedOperationException("This SchedulerService doesn't support the timed operations!");
      }
  
      @Override
      public AutoDisposable schedulePeriodically(Runnable task, long initialDelay, long period, TimeUnit unit) {
          throw new UnsupportedOperationException("This SchedulerService doesn't support the timed operations!");
      }
  
      @Override
      public Worker worker() {
          return this;
      }
  
      @Override
      public long now(TimeUnit unit) {
          return unit.convert(System.currentTimeMillis(), TimeUnit.MILLISECONDS);
      }
  
      @Override
      public void close() {
          // deliberately no-op
      }
  
      static final class ImmediatelyDone implements AutoDisposable {
  
          @Override
          public void close() {
              // deliberately no-op
          }
  
          @Override
          public String toString() {
              return "ImmediatelyDone";
          }
      }
  }
  